The undergrounds with no experience required. In this tour, we visit the 550-meter-long underground World War II fortress and offer you the opportunity to try abseiling – descending a rock face with a rope. The fortress remained unfinished and is therefore a unique combination of architecture created by both man and nature. And that is not all. Until a few years ago, this building was forgotten and hidden. It was only recently discovered, put to rights and equipped for visitors. Depending on the difficulty level of the abseiling you want to try and you feel comfortable with, we offer this tour in 2 versions: Abseil and Abseil Plus. Abseil Included is a tour of the underground fortress San Giovanni and abseiling in one and/or two ways with variations in difficulty. The easier variant involves a walking descent down a vertical rock. After it, the descent can be repeated in a slightly more difficult variant - with a vertical jump.